Cause

This can be caused by storing nt: unstructured directly under cq: Page nodes instead of storing them under the jcr: content (cq: PageContent) node of pages.

For example:
Wrong:
/content/geometrixx/en/footer/copyright

Correct:
/content/geometrixx/en/jcr:content/footer/copyright

Resolution

Move the problematic nodes under the jcr: content subnodes of pages instead of storing them directly under the cq: Page node. Storing content under the cq: PageContent (jcr: content) node structure is the best practice approach.